Nc97 Posted January 26, 2010 Share Posted January 26, 2010 Got a turbine overheat indication on the T-handle and on the instrument panel and I can't figure out where my problem is. I've checked all four of the detectors in the clam shell (checked good) and installed a new keyer but those dang lights in the T-handle keep blinking. Any help ya'll can provide would be great. Quote Link to comment Share on other sites More sharing options...
Plaprad Posted January 26, 2010 Share Posted January 26, 2010 We've had a few do this when the detectors get wet, could rain have gotten in? Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted January 26, 2010 Share Posted January 26, 2010 We've had a few do this when the detectors get wet, could rain have gotten in? Second that! Unless you really DO have an overheat problem. I'm assuming a man-on-stand run has already been done .......??? Quote Link to comment Share on other sites More sharing options...
C130CC Posted January 26, 2010 Share Posted January 26, 2010 Might have a bleed air leak, don't rule that out, I helped change the Y duct on the aft inboard side of the engine a couple months ago. It was cracked and blowing hot air on the detectors. Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted January 26, 2010 Share Posted January 26, 2010 Might have a bleed air leak, don't rule that out, I helped change the Y duct on the aft inboard side of the engine a couple months ago. It was cracked and blowing hot air on the detectors. Turbine, not nacelle. Just wondering if the bearing support case is cracked ..... man-on-stand ...... Quote Link to comment Share on other sites More sharing options...
Nc97 Posted January 26, 2010 Author Share Posted January 26, 2010 Let me clarify, engine is not running, #4 engine T-Handle is blinking (overheat indication as soon as power is applied). Thanks!!! Quote Link to comment Share on other sites More sharing options...
MAXTORQ Posted January 26, 2010 Share Posted January 26, 2010 Has the EE shop tested the detectors. More often that not the boots that cover them get moisture build up and rot the connections. Don't rule out a bad harness , check all clamps as they are just metal ADELS and can cause chafing and ground out the sensor causing a light. Man on stand however probably won't show a thing with the doors open . Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted January 26, 2010 Share Posted January 26, 2010 Let me clarify, engine is not running, #4 engine T-Handle is blinking (overheat indication as soon as power is applied). Thanks!!! HA! Different ballgame, then. One of 2 things - water in/on detectors, faulty wiring Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted January 26, 2010 Share Posted January 26, 2010 Man on stand however probably won't show a thing with the doors open . It does if you're doing a flag-check (that's what US military calls it, I think) Quote Link to comment Share on other sites More sharing options...
MAXTORQ Posted January 26, 2010 Share Posted January 26, 2010 It does if you're doing a flag-check (that's what US military calls it, I think) Yep double strand of safety wire and a white rag streamer. If it is a turbine issue in normal GI ,but its still a pain even with 2,000 LB or reverse. Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted January 26, 2010 Share Posted January 26, 2010 (edited) Disconnect each detector one at a time and see which one is causing the issue. If all four are disconnected and you still have your condition look at the wiring above the turbine. (the area inspected during an engine change). (wires burn in this area and sag onto the turbine case or slide in the clamps and cause overheat indications.) If no defect or cant see the area disconnect your wires at the terminal board (TB107 for our AC). If the indication stops your problem is wiring between the TB and detectors. You may need to drop the motor and rewire or "tape" the wires with high temp tape... If the wires are burnt might want to rewire but usually can get by with tape until rework or a Phase/ISO. If the condition persists after the TB is disconnected you need to break out the wiring diagram and chase it backwards to find your ground.(wing break, overhead disconnect) Lets us know what you find...my bet is detector or wiring above turbine area.... Edited January 27, 2010 by NATOPS1 Quote Link to comment Share on other sites More sharing options...
olcatmech2 Posted January 26, 2010 Share Posted January 26, 2010 Oh how I would love to get out the 2-13 (if that is what still contains the wiring diagrams) and troubleshoot it for you. Would make one ol man happy! Quote Link to comment Share on other sites More sharing options...
L382fe Posted January 27, 2010 Share Posted January 27, 2010 Used to see this a lot when using the birdbath. Would get turbine and nacelle overheats about the time we finished and were rolling to park. Mx had to dry and seal the cannon plugs in the drybay going into the QEC. Mike Quote Link to comment Share on other sites More sharing options...
Rojo1038 Posted January 27, 2010 Share Posted January 27, 2010 Well I do thank all for your suggestions but it appears I looked into this problem way too deep. I really feel dumb for not checking out the lights in the T-handle itself. I forget which TCTO modifies this, but there is a little piece of plastic that is supposed to slide between the top and bottom light bulb holders. Someone had removed it and uppon reinstalling they caught the ground contact on one of the bottom bulbs and had it jammed against the ground contact of the top bulb holder. So after three long days of troubleshooting and digging around in the 2-13, all it took to fix it was a flat head screwdriver. I'm dissappointed with myself for not catching that but I can guarantee it will be the first thing I check from now on. Thanks to all again. Quote Link to comment Share on other sites More sharing options...
Rojo1038 Posted January 27, 2010 Share Posted January 27, 2010 (edited) Sorry new to the forum and add this post twice Edited January 27, 2010 by Rojo1038 Sorry new to the forum and add this post twice Quote Link to comment Share on other sites More sharing options...
Dan Wilson Posted January 27, 2010 Share Posted January 27, 2010 Dont feel too bad, we all get to where we cant see the forest for the trees. It happens. Dan Quote Link to comment Share on other sites More sharing options...
jetcal1 Posted January 27, 2010 Share Posted January 27, 2010 Rojo, The occasional fun of "How did I miss that" is how we acquire knowledge, next time it happens; people will think you’re a genius. And remember: “As airplanes age they break in new and interesting ways.†Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted January 29, 2010 Share Posted January 29, 2010 NEXT time I will start with the Fire Handle Light bulbs....remove one at a time to see if the indication goes away.....every new day brings a new way.... Disconnect each detector one at a time and see which one is causing the issue. If all four are disconnected and you still have your condition look at the wiring above the turbine. (the area inspected during an engine change). (wires burn in this area and sag onto the turbine case or slide in the clamps and cause overheat indications.) If no defect or cant see the area disconnect your wires at the terminal board (TB107 for our AC). If the indication stops your problem is wiring between the TB and detectors. You may need to drop the motor and rewire or "tape" the wires with high temp tape... If the wires are burnt might want to rewire but usually can get by with tape until rework or a Phase/ISO. If the condition persists after the TB is disconnected you need to break out the wiring diagram and chase it backwards to find your ground.(wing break, overhead disconnect) Quote Link to comment Share on other sites More sharing options...
Dave in WV Posted January 30, 2010 Share Posted January 30, 2010 We used to have turbine overheat indication problems after the plances came off of the wash rack. Usually it was after engine start and if we knew the plane had just been washed we let it blink for a while and the problem went away after a few minutes. Quote Link to comment Share on other sites More sharing options...
Talon2CC Posted February 4, 2010 Share Posted February 4, 2010 glad you found the problem, whats the tail # on it? Quote Link to comment Share on other sites More sharing options...
herky400M Posted February 4, 2010 Share Posted February 4, 2010 Hy C130 world, I had got a simular problem, but it was just the fire indicator who was blinking! I'm for the moment @ Kisangani (Congo) where we had an night of pooring rain, and in the morning the master warning light was flashing, but no T-handles. I did the test to look what engine it was, but no luck I thougth it was the relay, so I gave it a little smack. Than we ruled out by pulling CB's, and it was the turbine Overheat! #3 we opend the tail and water was flushing out the section, we checked all probes, they where ok, but the connector on the lefthand door was full of moister and full of humidity, cleaned it, put some silicone spray in it and done. look for moister and humidity in the contacts! greetz from CONGO:D Quote Link to comment Share on other sites More sharing options...
bischoffm Posted February 5, 2010 Share Posted February 5, 2010 Make sure the detector brackets are not loose and wire is not chaffing anywhere in the nacelle Quote Link to comment Share on other sites More sharing options...
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